Buckle device

ABSTRACT

A buckle apparatus comprises insertion control means press-operating an ejector ( 13 ) when a pair of tongue parts ( 5   c,    6   c ) are simultaneously inserted into a buckle body ( 2 ) for allowing insertion up to an engaging position between the respective tongue parts ( 5   c,    6   c ) and an engaging member ( 10 ) while regulating the press operation by posture tilting of the ejector ( 13 ) when only one tongue part ( 5   c,    6   c ) is inserted. The insertion control means comprises a frame member ( 15 ) having a guide rail part ( 15   g ) reciprocatively slidingly guiding the ejector ( 13 ) along the direction of the press operation while comprising a stopper part ( 15   k ) separably coming into contact with the ejector ( 13 ) in posture tilting from an insertion allowing posture for regulating movement in the direction of the press operation on the guide rail part ( 15   g ).

TECHNICAL FIELD

[0001] The present invention relates to an improvement of a buckleapparatus, used for a child seat or the like, having a system ofsubstantially simultaneously inserting and mounting a pair of tonguemembers.

BACKGROUND ART

[0002] In recent years, a child seat mounted on a seat of an automobileis used in order to protect a juvenile in the automobile against injuryor mitigate the injury at the time of a traffic accident or the like bythe automobile.

[0003] As a seat belt apparatus employed for this type of child seat, anend of a crotch webbing is fixed to the front center of a seat portionof the child seat and a buckle body is mounted on the other end of thiscrotch webbing, for example. Further, tongue members are mounted onwebbings attached to extend over the right and left shoulders and theright and left hips of a juvenile sitting on the seat portion of thechild seat respectively. It is so structured that the pair of tonguemembers are inserted into the buckle body thereby disengageably engagingwith each other.

[0004] This type of disengageable buckle apparatus includes the onedisclosed in Japanese Patent Application Laying-Open Gazette No.8-70912, which has been brought into a structure comprising a pair oftongue members, an engaging member rotatably arranged in a buckle bodyfor disengageably engaging with the respective tongue members, anejector urged by an extrusion spring for urging the respective tonguemembers in a dissociative direction and a regulation plate inhibitingrotation of the engaging member in the engaging direction with respectto the tongue members when only one tongue member is inserted into thebuckle body.

[0005] And it has been so structured that the regulation plate isrotated by the tongue member to inhibit rotation of the engaging memberin the engaging direction so that no locked state resulting fromengagement of the tongue member is attained when inserting only onetongue member into the buckle body and so structured that the regulationplate does not rotate but the engaging member engages with both tonguemembers so that an excellent locked state is attained whensimultaneously inserting the pair of tongue members, to be brought intoa structure aiming at improvement of reliability of the locked states onthe side of the tongue members and the side of the buckle body.

[0006] According to the buckle apparatus disclosed in the aforementionedconventional gazette, however, it is a system separately comprising therotatably supported regulation plate, and there has been such a defectthat the number of components such as the regulation plate and aplurality of springs for setting the initial position of the regulationplate increases to result in a high cost.

[0007] Further, there has been such a problem that a space for rotatingthe regulation plate is also required to cause size increase of theoverall apparatus and complication of the structure, and it is alsoinferior in assembling workability.

DISCLOSURE OF THE INVENTION

[0008] An object of the present invention is to provide a buckleapparatus having a compact and simple structure by suppressing increaseof the number of components.

[0009] In one mode of the buckle apparatus according to the presentinvention, a buckle apparatus wherein an ejector comprised in a bucklebody is press-operated against urging force of an extrusion spring dueto insertion of a pair of tongue members into the buckle body while anengaging member disengageably engaging with the tongue members due toarrival of the tongue members on an engaging position is comprised inthe buckle body for urging the tongue members in a dissociativedirection by the extrusion spring through the ejector due to release ofthe engagement of the tongue members and the engaging member is broughtinto such a structure that such insertion control means that the ejectoris subjected to the press operation in an insertion allowing posture toallow insertion of the respective tongue members up to the engagingposition when the pair of tongue members are substantiallysimultaneously subjected to the insertion while the press operation isregulated by posture tilting of the ejector to suppress insertion of thetongue members up to the engaging position when only one said tonguemember is subjected to the insertion is provided in the buckle body.

[0010] According to this mode, insertion of the tongue members isrestricted by posture tilting of the ejector, whereby a buckle apparatushaving a compact and simple structure can be advantageously providedwhile suppressing increase of the number of components.

[0011] In another mode of the buckle apparatus according to the presentinvention, the insertion control means consists of a frame member havinga guide rail part slidingly guiding the ejector in the said insertionallowing posture to be reciprocative along the direction of the pressoperation and a stopper part separably coming into contact with theejector in the posture tilting from the insertion allowing posture forregulating movement in the direction of the press operation, and thesaid stopper part is brought into a structure provided on the guide railpart.

[0012] According to this mode, there is such an advantage that insertioncontrol of the tongue members can be more effectively performed withoutincreasing the number of components.

[0013] In still another mode of the buckle apparatus according to thepresent invention, a tongue contact part of the ejector coming intocontact with the both tongue members in the press operation is broughtinto a structure formed in a sharp shape toward the dissociativedirection.

[0014] According to this mode, there is such an advantage that theejector readily posture-tilts when only one tongue member is inserted tobe capable of improving suppression performance for not unpreparedlyinserting the tongue member to the engaging position with the engagingmember.

[0015] In a further mode of the buckle apparatus according to thepresent invention, insertion side end surfaces of the pair of tonguemembers coming into contact with the ejector for performing the pressoperation are brought into structures mutually inwardly inclinatorilyformed.

[0016] According to this mode, there is such an advantage that theejector can be stably held on central positions of both tongue membersand the ejector can be stably press-operated in the insertion allowingposture along the insertion direction thereof to be more reliablyengaged with the engaging member when substantially simultaneouslyinserting both tongue members.

[0017] In a further mode of the buckle apparatus according to thepresent invention, a posture holding guide separably coming into contactwith the ejector urged by the extrusion spring for holding the ejectorin the insertion allowing posture in an insertion standby state for thetongue members is brought into a structure provided on the frame member.

[0018] According to this mode, there is such an advantage that theejector can be made to stably stand by in the insertion allowing postureand control operation in insertion of the tongue members can be stablyexerted.

BRIEF DESCRIPTION OF THE DRAWINGS

[0019]FIG. 1 is an operational explanatory diagram in an embodiment ofthe present invention.

[0020]FIG. 2 is a view taken along the line II-II in FIG. 1.

[0021]FIG. 3 is a view taken along the line III-III in FIG. 1.

[0022]FIG. 4 is an operational explanatory diagram for insertion of atongue member.

[0023]FIG. 5 is an operational explanatory diagram for insertion oftongue parts in a state detaching an upper cover body.

[0024]FIG. 6 is a partially fragmented sectional view taken along theline VI-VI in FIG. 5.

[0025]FIG. 7 is an operational explanatory diagram for insertion of thetongue parts in the state detaching the upper cover body.

[0026]FIG. 8 is a partially fragmented sectional view taken along theline VIII-VIII in FIG. 7.

[0027]FIG. 9 is an operational explanatory diagram for insertion of onlyone tongue part in the state detaching the upper cover body.

[0028]FIG. 10 is a plan view of a lower cover body.

[0029]FIG. 11 is a plan view of a frame member.

[0030]FIG. 12 is a sectional view taken along the line XII-XII in FIG.11.

[0031]FIG. 13 is a bottom plan view of the upper cover body.

[0032]FIG. 14 is a plan view of an ejector.

[0033]FIG. 15 is a view taken along the line XV-XV in FIG. 14.

[0034]FIG. 16 is a bottom plan view of the ejector.

[0035]FIG. 17 is a view taken along the line XVII-XVII in FIG. 14.

[0036]FIG. 18 is a view taken along the line XVIII-XVIII in FIG. 14.

[0037]FIG. 19 is a plan view of an engaging member.

[0038]FIG. 20 is a view taken along the line XX-XX in FIG. 19.

[0039]FIG. 21 is a view taken along the line XXI-XXI in FIG. 19.

[0040]FIG. 22 is a plan view of a disengagement button.

[0041]FIG. 23 is a view taken along the line XXIII-XXIII in FIG. 22.

[0042]FIG. 24 is a view taken along the line XXIV-XXIV in FIG. 22.

[0043]FIG. 25 is a sectional view taken along the line XXV-XXV in FIG.22.

[0044]FIG. 26 is a sectional view of a plate spring.

[0045]FIG. 27 is a plan view of the plate spring.

[0046]FIG. 28 is a side elevational view of a display member.

[0047]FIG. 29 is a view taken along the line XXIX-XXIX in FIG. 28.

[0048]FIG. 30 is a rear elevational view of FIG. 29.

BEST MODE FOR CARRYING OUT THE INVENTION

[0049] Describing an embodiment of the buckle apparatus according to thepresent invention with reference to the drawings, it is structured by abuckle body 2 mounted on an end of a crotch webbing 1 fixed to a seatportion of a child seat and a pair of tongue members 5 and 6 mounted onwebbings 3 and 4 attached to extend over the right and left shouldersand the right and left hips of a juvenile sitting on the seat portion ofthe child seat respectively, and so structured that mutuallydisengageably engaging locked states are obtained by inserting thesetongue members 5 and 6 into the buckle body 2, as shown in FIG. 1 toFIG. 4.

[0050] The respective tongue members 5 and 6 are formed by molding metalplates 7 and 8 formed in proper shapes with resin and comprise webbingmounting parts 5 b and 6 b having webbing insertion holes 5 a and 6 aon/to which the webbings 3 and 4 are insertionally mounted/fixedrespectively on single sides, while tongue parts 5 c and 6 csubstantially in the form of flat plates inserted into the buckle body 2are comprised on second sides respectively.

[0051] Locating projections 5 d and 5 e are formed on one side surfaceand the upper surface of one tongue part 5 c respectively, in order tomutually arrange the respective tongue parts 5 c and 6 c side-by-side tobe simultaneously insertable into the buckle body 2. Engagingconcavities 6 e and 6 f in which the locating projections 5 d and 5 eare disengageably engaged respectively are formed on one side surface ofthe opposite tongue part 6 c and a side of the upper surface closer tothe lower surface of an extension part 6 d respectively.

[0052] Rectangular engaging holes 5 g and 6 g in which an engagingmember 10 shown in FIG. 5 to FIG. 9 and FIG. 19 to FIG. 21 is engageablyengaged are formed on the respective tongue parts 5 c and 6 crespectively. At this time, the metal plates 7 and 8 on the peripheraledge portions of the respective engaging holes 5 g and 6 g and portionsfrom the respective engaging holes 5 g and 6 g to forward ends of thetongue members 5 and 6 along the insertion direction are exposedlystructured.

[0053] The buckle body 2 comprises an upper cover body 11 and a lowercover body 12 brought into shapes vertically divided into two, so thatthe engaging members 10 disengageably engaged with the inserted tongueparts 5 c and 6 c, an ejector 13 ejecting the tongue parts 5 c and 6 c,an extrusion spring 14 urging the ejector 13 in an extrusive direction,i.e., a dissociative direction P, a frame member 15 supporting theengaging member 10, the ejector 13, the extrusion spring 14 etc., adisengagement button 16 releasing the engagement of the tongue parts 5 cand 6 c and the engaging member 10 and a display member 17 displayingthe engaging state of the tongue parts 5 c and 6 c and the engagingmember 10 are storedly attached between both cover bodies 11 and 12.

[0054] The lower cover body 12 is molded out of resin or the like, and awebbing insertion hole 12 a on/to which the crotch webbing 1 isinsertionally mounted/fixed is formed and a screw insertion hole 12 bfor fixing the upper cover body 11 and the frame member 15 to each otheris formed on an end of the lower cover body 12, as also shown in FIG.10. The other end of the lower cover body 12 is rendered a tongueinsertion part 19 into which the tongue parts 5 c and 6 c are inserted,while engaging walls 12 c are uprightly provided on both side edgeportions of the lower cover body 12 located on both sides of the tongueinsertion part 19 and stop parts 12 d projecting outward areprojectingly provided on upper edge portions of the respective engagingwalls 12 c respectively.

[0055] Further, an elongated ejector guide groove 12 e having a properwidth is formed on the bottom surface of the lower cover body 12 fromthe central portion in the direction of the webbing insertion hole 12 aand a stop concavity 12 f on which a stop fragment part 15 aprojectingly formed on the frame member 15 is stopped is formed on theside of the tongue insertion part 19 while stop parts 12 g disengageablyengaged with the upper surfaces of both side edge portions of the framemember 15 are formed on both sides of the webbing insertion hole 12 arespectively.

[0056] The frame member 15 consists of a properly bent/formed metalplate, and is brought into a structure comprising a substantiallyrectangular substrate part 15 b, the said stop fragment part 15 aprojectingly formed on a longitudinal end of the substrate part 15 b andsupport wall parts 15 c oppositely uprightly provided from both sideedge portions of the substrate part 15 b respectively, as also shown inFIG. 11 and FIG. 12. The portion between these support wall parts 15 cis structured as a tongue insertion path 19 a for both tongue parts 5 cand 6 c inserted from the tongue insertion part 19.

[0057] Further, the substrate part 15 b is formed with a webbinginsertion hole 15 d and a screw insertion hole 15 e renderedcommunicative with the webbing insertion hole 12 a and the screwinsertion hole 12 b of the lower cover body 12, while a guide hole 15 fguiding the ejector 13 along the longitudinal direction is formed on thecentral portion.

[0058] The upper cover body 11 is molded out of resin or the like inorder to cover the upper surface side of the lower cover body 12, formedwith stop cavities 11 a in which the respective stop parts 12 d of thelower cover body 12 are disengageably stopped, and formed with a webbinginsertion hole 11 b and a screw insertion hole 11 c renderedcommunicative with the webbing insertion hole 12 a and the screwinsertion hole 12 b of the lower cover body 12, as also shown in FIG.13.

[0059] The side of the upper cover body 11 closer to the tongueinsertion part 19 is formed with an operational opening 11 d of acorresponding shape in which the cancel button 16 is rendered exposedand formed with a display window 11 e located between the operationalopening 11 d and the webbing insertion hole 11 b so that the displaymember 17 can be visually recognized.

[0060] The ejector 13 is formed into a substantially triangular shape inplan view by resin or the like as also shown in FIG. 14 to FIG. 18, andcomprises a slide base part 13 a arranged under the substrate part 15 bof the frame member 15, a slide guide part 13 b located in the guidehole 15 f on the upper surface side of the slide base part 13 a whilehaving a height substantially identical to the thickness of thesubstrate part 15 b, a slide vane part 13 c extensionally formed on theupper surface side of the slide guide part 13 b from an end opposite tothe tongue insertion part 19 on an upper area of the slide base part 13a on the upper side of the substrate part 15 b and a tongue contact part13 d projectingly formed upwardly beyond the upper surface of the slideguide part 13 b on the central portion of the ejector 13.

[0061] Here, rail groove parts 13 g in which both guide rail parts 15 gstructured by both side edge portions of the guide hole 15 f in theframe member 15 shown in FIG. 5, FIG. 7, FIG. 9 and FIG. 11 are slidablyengaged respectively are structured between the upper and lower slidevane part 13 c and slide base part 13 a.

[0062] An end of the slide base part 13 a projecting beyond the slideguide part 13 b in the direction of the tongue insertion part 19 isrendered a narrow lingual part 13 e, and a boss part 13 f engaged in theejector guide groove 12 e and slidable along the longitudinal directionthereof is comprised on the lower surface side of the central portion ofthe slide base part 13 a. At this time, the boss part 13 f issubstantially cylindrically formed and its end surface closer to thetongue insertion part 19 is formed in a flat surface as shown in FIG.16, to separably come into contact with a flat surface on the side ofthe ejector guide groove 12 e shown in FIG. 10 closer to the tongueinsertion part 19.

[0063] Further, the tongue contact part 13 d is formed in a sharptriangular shape toward the dissociative direction P as shown in FIG. 5,FIG. 7, FIG. 9 and FIG. 14, and so structured that its sharp forward endportion is located on the centers of both tongue parts 5 c and 6 cinserted from the tongue insertion part 19. At this time, insertion sideend surfaces 5 h and 6 h of both tongue parts 5 c and 6 c are mutuallyinwardly inclinatorily formed, and so structured that the said insertionside end surfaces 5 h and 6 h separably come into contact with both sidesurfaces of the tongue contact part 13 d brought into the triangularshape.

[0064] A spring bearing hole 13 h in the form of a circular hole isformed on an end surface of the ejector 13 opposite to the lingual part13 e as shown in FIG. 14 to FIG. 16 and FIG. 18 and the extrusion spring14 consisting of a coil spring is compressively mounted between the sameand a spring support projection 15 h comprised on the frame member 15 asshown in FIG. 5 to FIG. 9, so that the ejector 13 is elastically urgedin the direction of the tongue insertion part 19, i.e., in thedissociative direction P due to the urging force of this extrusionspring 14.

[0065] At this time, an edge portion of the guide hole 15 f closer tothe tongue insertion part 19 is formed in an arcuate shape swelling outin the direction of the tongue insertion part 19 on thewidth-directional central portion and structured as a posture holdingguide 15 j guiding the forward end portion of the slide guide part 13 bto the width-directional center in an insertion standby state where therespective tongue parts 5 c and 6 c are uninserted into the ejector 13urged by the extrusion spring 14, as shown in FIG. 5 and FIG. 11. Theforward end portion of the slide guide part 13 b slidably coming intocontact with the posture holding guide 15 j is structured in a properpolygonal shape projecting on the width-directional central portion oran arcuate shape corresponding to the posture holding guide 15 j. Inthis case, it is also brought into contact with the flat surface of theejector guide groove 12 e closer to the tongue insertion part 19 and theflat surface on the boss part 13 f of the ejector 13.

[0066] When both tongue parts 5 c and 6 c are substantiallysimultaneously inserted from the tongue insertion part 19 in thisinsertion standby state, the ejector 13 is structured to bepress-operated along the insertion direction Q of both tongue parts 5 cand 6 c in the state of the posture. Here, the ejector 13 is structuredto stably stand by in an insertion allowing posture in the insertionstandby state.

[0067] On the upper surface side of the tongue contact part 13 d, anupwardly tilting engaging member holding guide 13 j and a downwardlytilting display member holding guide 13 k are comprised respectivelyalong the insertion direction Q of both tongue parts 5 c and 6 c.

[0068] Further, stopper parts 15 k separably coming into contact withthe slide guide part 13 b due to posture tilting around the boss part 13f from the insertion allowing posture of the ejector 13 for regulatingmovement in the direction of the press operation, i.e., in the insertiondirection Q are extensionally formed on both guide rail parts 15 grespectively. At this time, the stopper parts 15 k are extendedsubstantially in the form of trapezoids and comprised in a pairseparably in the insertion direction Q for the respective tongue parts 5c and 6 c.

[0069] Both side portions of the slide guide part 13 b closer to thetongue insertion part 19 are formed in the shape of narrowconstrictions, in order to allow the posture tilting of the ejector 13.

[0070] As also shown in FIG. 19 to FIG. 21, the engaging member 10 isprepared by bending/forming a metal plate into a proper shape by pressworking or the like, and structured by a rectangular flat supportfragment part 10 a swingably supported between holding holes 15 m formedon both support wall parts 15 c of the frame member 15 respectively, adisengagement operational fragment part 10 b upwardly inclinatorilyextensionally provided from an edge of the support fragment part 10 acloser to the tongue insertion part 19 and engaging projections 10 cdownwardly projectingly formed on the support fragment part 10 arespectively in correspondence to the positions of the engaging holes 5g and 6 g of the respective tongue parts 5 c and 6 c inserted along thetongue insertion path 19 a and disengageably engaged in the respectiveengaging holes 5 g and 6 g.

[0071] As shown in FIG. 22 to FIG. 25, the disengagement button 16 ismolded out of resin or the like, and structured by a press operationpart 16 a substantially circular in plan view, spindle parts 16 bcomprised to extend on both side portions on a side of the pressoperation part 16 a closer to the tongue insertion part 19, returnregulation vanes 16 c extensionally formed along both side portions ofthe outer side surface of the press operation part 16 a respectively andoperational projections 16 d downwardly projectingly formed on bothsides of intermediate parts of the respective tongue parts 5 c and 6 calong the insertion direction on the lower surface side of the pressoperation part 16 a respectively. The upper surface of the pressoperation part 16 a is properly formed with non-slip projections 16 eserving as non-slips in the press operation.

[0072] As shown in FIG. 25, the peripheral surfaces of the spindle parts16 b located on the lower surface side of the press operation part 16 aare partially notchedly formed so that a fitting part 21 a of a properlybent/formed plate spring 21 shown in FIG. 26 and FIG. 27 is fitted inthe spindle parts 16 b of these portions as shown in FIG. 6 and FIG. 8,so that a fitted and uprightly formed stop fragment 21 b is preventedfrom displacement and stopped on the spindle parts 16 b.

[0073] As shown in FIG. 6 and FIG. 8, the spindle parts 16 b projectingon both sides of the disengagement button 16 are relatively rotatablysupported by support concavities 15 n comprised on ends of both supportwall parts 15 c of the frame member 15 closer to the tongue insertionpart 19 respectively and support concavities 11 f formed on the lowersurface of the upper cover body 11 closer to the tongue insertion part19 respectively. At this time, a push-down part 21 c on a bent end ofthe plate spring 21 is elastically brought into contact with the uppersurface of an end of the support fragment part 10 a of the engagingmember 10 opposite to the disengagement operational fragment part 10 band brought into a structure making elastic urging in order to push downthe end of the support fragment part 10 a downward.

[0074] As shown in FIG. 28 to FIG. 30, the display member 17 is formedby resin or the like, and comprises an arcuate display part 17 a,spindle parts 17 b extensionally formed on both side portions in orderto support the display part 17 a and a spring bearing part 17 cprojectingly formed on one side surface. The display part 17 a isdivided into two, i.e., an unlocked state display area A colored red anda locked state display area B colored green along the peripheraldirection.

[0075] As shown by phantom lines in FIG. 28, both spindle parts 17 b arerelatively rotatably supported in support concavities 15 p formed onboth support wall parts 15 c respectively in order to bush-engage thecentral portion of a torsion spring 23 in one spindle part 17 b,bush-stop one end to the spring bearing parts 17 c and compressivelybring the other end onto the substrate part 15 b of the frame member 15,and separation of the spindle parts 17 b from the respective supportconcavities 15 p is regulated by holding concavities 11 g comprised onthe lower surface of the upper cover body 11.

[0076] This display member 17 is so structured that an edge located onthe side of the display part 17 a in the direction of the tongueinsertion part 19 is brought into contact with the display memberholding guide 13 k due to the urging force of the torsion spring 23 andthe unlocked state display area A is located in correspondence to thedisplay window 11 e in the insertion standby state of both tongue parts5 c and 6 c, as shown in FIG. 6. Further, it is so structured that, in alocked state where both tongue parts 5 c and 6 c are inserted, thedisplay member 17 is rotationally operated about the spindle parts 17 bagainst the urging force of the torsion spring 23 due to relativesliding of a slide part 17 d comprised on the display member 17 and thedisplay member holding guide 13 k and the locked state display area B islocated in correspondence to the display window 11 e, as shown in FIG.8.

[0077] Mutually inwardly projecting guide boss parts 15 q areprojectingly provided on both support wall parts 15 c of the framemember 15 as shown in FIG. 11 and FIG. 12, in order to regulate floatingof insertion end sides when the respective tongue parts 5 c and 6 c areinserted along the tongue insertion path 19 a.

[0078] This embodiment is structured in the aforementioned manner, andthe ejector 13 is urged by the urging force of the extrusion spring 14in the direction of the tongue insertion part 19 so that an end of theslide guide part 13 b located in the direction of the tongue insertionpart 19 comes into contact with the posture holding guide 15 j of theframe member 15 while the flat surface of the boss part 13 f is broughtinto contact with the flat surface of the ejector guide groove 12 e andheld in the insertion allowing posture press-movable along the insertiondirection of both tongue parts 5 c and 6 c in a non-insertion state ofthe respective tongue parts 5 c and 6 c, as shown in FIG. 5 and FIG. 6.

[0079] The engaging member 10 is held in the engaging member holdingguide 13 j, the engaging projections 10 c are retreated upward beyondthe tongue insertion path 19 a, the slide part 17 d comes into contactwith the display member holding guide 13 k in the display member 17, andthe unlocked state display area A is located in the display window 11 e.At this time, the disengagement button 16 is upwardly urged about thespindle parts 16 b due to the urging force of the plate spring 21, andboth return regulation vanes 16 c come into contact with the peripheraledge portion of the operational opening 11 d and are hold in aprescribed posture.

[0080] When the respective tongue parts 5 c and 6 c of both tonguemembers 5 and 6 are simultaneously successively inserted from the tongueinsertion part 19 along the tongue insertion path 19 a from this state,the end surfaces 5 h and 6 h of both tongue parts 5 and 6 come intocontact with both side surfaces of the tongue contact part 13 drespectively, and the ejector 13 is press-operated against the urgingforce of the extrusion spring 14 when both tongue parts 5 c and 6 c arefurther successively inserted. At this time, the tongue contact part 13d is formed in the sharp triangular shape with respect to thedissociative direction P and the end surfaces 5 h and 6 h of both tongueparts 5 c and 6 c are mutually inwardly inclinatorily formed, wherebythe ejector 13 is press-operated along the insertion direction Q underguiding by both guide rail parts 15 g while maintaining its insertionallowing posture.

[0081] Following the movement of the ejector 13 in the insertiondirection Q according to this press operation, the side of the engagingmember 10 closer to the engaging projections 10 c is downwardly operatedalong the engaging member holding guide 13 j under the urging force bythe plate spring 21. In the display member 17, the slide part 17 d isslid along the display member holding guide 13 k and the display member17 is rotationally operated about the spindle parts 17 b against theurging force of the torsion spring 23.

[0082] Thereafter the engaging member 10 separates from the engagingmember holding guide 13 j when the respective engaging projections 10 ccome into contact with upper portions of the tongue parts 5 c and 6 cdue to insertion of both tongue parts 5 c and 6 c, and the locked statewhere both engaging projections 10 c are downwardly operated to enterthe respective engaging holes 5 g and 6 g and engage therewith isobtained under the urging force by the plate spring 21 as shown in FIG.7 and FIG. 8 when both tongue parts 5 c and 6 c are inserted and therespective engaging holes 5 g and 6 g reach prescribed positions.

[0083] At this time, the display member 17 is further rotationallyoperated about the spindle parts 17 b due to relative sliding of thedisplay member holding guide 13 k and the slide part 17 d, so that thelocked state display area B is located in correspondence to the positionof the display window 11 e and the locked state can be also visuallyconfirmed.

[0084] In a case of subsequently releasing this locked state, theoperational projections 16 d come into contact with the disengagementoperational fragment part 10 b when pushdown-operating the disengagementbutton 16 against the urging force of the plate spring 21, and the sidecloser to the engaging projections 10 c is upwardly operated whenfurther pushdown-operating the same so that the engaging state of therespective engaging holes 5 g and 6 g and the respective engagingprojections 10 c is released.

[0085] When this engaging body is released, the ejector 13 is extrudedin the dissociative direction P due to the urging force accumulated inthe extrusion spring 13, and the respective tongue parts 5 c and 6 c areextruded in the direction opposite to the insertion direction Q anddissociative-operated due to this movement of the ejector 13 in thedissociative direction P.

[0086] At this time, an end of the support fragment part 10 a is placedon the engaging member holding guide 13 j, and the engaging projections10 c retreat upward beyond the tongue insertion path 19 a as shown inFIG. 6. In the display member 17, on the other hand, the display memberholding guide 13 k and the slide part 17 d are relatively slid due tothe urging force accumulated in the torsion spring 23, so that theunlocked state display area A of the display part 17 a is returned tothe position of the display window 11 e, as shown in FIG. 6. Whenreleasing the pushdown force against the disengagement button 16 at thispoint, it returns to the initial state as the insertion standby statefor the tongue members 5 and 6 shown in FIG. 6.

[0087] In a case of inserting only one tongue part 6 c from the tongueinsertion part 19 as shown in FIG. 9, the end surface 6 h which is theinsertion end of the tongue part 6 c comes into contact with one sidesurface of the tongue contact part 13 d, and when furtherforce-operating the tongue part 6 c in this state, the ejector 13 isurged by the extrusion spring 14 and hence the ejector 13 isrotationally operated about the axis of the boss part 13 f in thedirection where the tongue part 5 c is not inserted.

[0088] The ejector 13 deviates from the orbit subjected to ordinarypress operation due to posture tilting resulting from this rotation ofthe ejector 13, so that the end surface of the slide guide part 13 bopposite to the tongue insertion part 19 in the ejector 13 comes intocontact with the stopper parts 15 k and the press operation is regulatedeven if the tongue part 6 c is further force-operated from this state.At this time, the ejector 13 further posture-tilts so that the slideguide part 13 b on the side closer to the constricted tongue insertionpart 19 also comes into contact with the stopper parts 15 k, and thepress operation in the normal direction is regulated also from thispoint while subsequent posture tilting is also regulated, so that thetongue part 6 c cannot be further inserted.

[0089] Therefore, the tongue part 6 c cannot be inserted up to theengaging position where the engaging hole 6 g corresponds to theengaging projection 6 g but unprepared engagement between the engaginghole 6 g and the engaging projections 10 c can be prevented so thatfalse mounting by only one can be effectively prevented. A personmounting the tongue members 5 and 6 can sensuously fractionate that theinsertion stroke for the tongue parts 5 c and 6 c in engagement and theinsertion stroke in non-engagement obviously differ from each other, andcan quickly recognize that the tongue members 5 and 6 and the bucklebody 2 are in a non-engaging state.

[0090] When inserting only the tongue part 5 c on the side opposite tothe above, the ejector 13 posture-tilts in the direction opposite to theabove and similarly operates.

[0091] The insertion control means regulating the movement of the tongueparts 5 c and 6 c in the insertion direction is formed by only thesingle ejector 13 and the frame member 15 slide-guiding the same, thenumber of components may not be increased dissimilarly to the prior art,it is excellent in assembling workability with a simple structure, andcost reduction can be attained.

[0092] The ejector 13 is posture-tilted from the ordinary insertionallowing posture so that movement of the ejector 13 in the insertiondirection Q can be effectively suppressed, and the buckle body 2 may notbe largely structured but compactification can be attained as the wholeof the buckle apparatus.

[0093] Further, the tongue contact part 13 d of the ejector 13 isbrought into the sharp shape toward the dissociative direction P,whereby the same is readily posture-tilted from the insertion allowingposture when only one tongue part 5 c or 6 c is inserted so thatsuppression performance not unpreparedly inserting only one tongue part5 c or 6 c up to the engaging position with the engaging member 10 canbe effectively improved.

[0094] The end surfaces 5 h and 6 h of the tongue parts 5 c and 6 c inboth tongue members 5 and 6 are mutually inwardly inclinatorily formed,whereby the tongue contact part 13 d can be stably held on the centralpositions of both tongue parts 5 c and 6 c, the ejector 13 can be stablypress-operated along the insertion direction Q in the insertion allowingposture and the engaging holes 5 g and 6 g in both tongue parts 5 c and6 c and the respective engaging projections 10 c of the engaging member10 can be more reliably engaged when simultaneously inserting bothtongue parts 5 c and 6 c.

[0095] In the insertion standby state for the tongue members 5 and 6,further, the ejector 13 can be stably held in the insertion allowingposture due to the contact of the slide guide member 13 b with respectto the posture holding guide 15 j and the contact between the flatsurface of the boss part 13 f and the flat surface of the ejector guidegroove 12 e, and the aforementioned control operation in insertion canbe more stably exerted when the tongue members 5 and 6 aresimultaneously inserted or only one is inserted.

[0096] While the aforementioned embodiment shows the structure slidablyholding the ejector 13 on the frame member 15 mounted on the lower coverbody 12, a structure integrally comprising a structure similar to theframe member 15 on the lower cover body 12 for slidably holding theejector 13 may be employed.

[0097] Also in insertion of the respective tongue parts 5 c and 6 c withrespect to the tongue insertion path 19 a, the same may be substantiallysimultaneously inserted.

1. A buckle apparatus wherein an ejector (13) comprised in a buckle body(2) is press-operated against urging force of an extrusion spring (14)due to insertion of a pair of tongue members (5, 6) into the buckle body(2) while an engaging member (10) disengageably engaging with the tonguemembers (5, 6) due to arrival of the tongue members (5, 6) on anengaging position is comprised in the buckle body (2) for urging thetongue members (5, 6) in a dissociative direction by said extrusionspring (14) through said ejector (13) due to release of said engagementof said tongue members (5, 6) and said engaging member (10),characterized in that such insertion control means that said ejector(13) is subjected to said press operation in an insertion allowingposture to allow insertion of the respective tongue members (5, 6) up tosaid engaging position when said pair of tongue members (5, 6) aresubstantially simultaneously subjected to said insertion while saidpress operation is regulated by posture tilting of said ejector (13) tosuppress insertion of said tongue members (5, 6) up to said engagingposition when only one said tongue member (5, 6) is subjected to saidinsertion is provided in said buckle body (2).
 2. The buckle apparatusaccording to claim 1, wherein said insertion control means consists of aframe member (15) having a guide rail part (15 g) slidingly guiding saidejector (13) in said insertion allowing posture to be reciprocativealong the direction of said press operation and a stopper part (15 k)separably coming into contact with said ejector (13) in said posturetilting from said insertion allowing posture for regulating movement inthe direction of said press operation, and said stopper part (15 k) isprovided on said guide rail part (15 g).
 3. The buckle apparatusaccording to claim 2, wherein a tongue contact part (13 d) of saidejector (13) coming into contact with said both tongue members (5, 6) insaid press operation is formed in a sharp shape toward said dissociativedirection.
 4. The buckle apparatus according to claim 2, whereininsertion side end surfaces (5 h, 6 h) of said pair of tongue members(5, 6) coming into contact with said ejector (13) for performing saidpress operation are mutually inwardly inclinatorily formed.
 5. Thebuckle apparatus according to claim 3, wherein insertion side endsurfaces (5 h, 6 h) of said pair of tongue members (5, 6) coming intocontact with said ejector (13) for performing said press operation aremutually inwardly inclinatorily formed.
 6. The buckle apparatusaccording to claim 2, wherein a posture holding guide (15 j) separablycoming into contact with said ejector (13) urged by said extrusionspring (14) for holding the ejector (13) in said insertion allowingposture in an insertion standby state for said tongue members (5, 6) isprovided on said frame member (15).
 7. The buckle apparatus according toclaim 3, wherein a posture holding guide (15 j) separably coming intocontact with said ejector (13) urged by said extrusion spring (14) forholding the ejector (13) in said insertion allowing posture in aninsertion standby state for said tongue members (5, 6) is provided onsaid frame member (15).
 8. The buckle apparatus according to claim 4,wherein a posture holding guide (15 j) separably coming into contactwith said ejector (13) urged by said extrusion spring (14) for holdingthe ejector (13) in said insertion allowing posture in an insertionstandby state for said tongue members (5, 6) is provided on said framemember (15).
 9. The buckle apparatus according to claim 5, wherein aposture holding guide (15 j) separably coming into contact with saidejector (13) urged by said extrusion spring (14) for holding the ejector(13) in said insertion allowing posture in an insertion standby statefor said tongue members (5, 6) is provided on said frame member (15).